Feank lanbberg



l UNITED STATES ATENT Trice.

FRANK LANSBERG, OF ST. LOUIS, MISSOURI, ASSIGNOR OF ONEHALF TO THOMAS INGLIS, OF SAME PLACE.

AIR=BRAKE.

SPECIFICATION forming part of Letters Patent No. 392.872, dated November 13, 1888.

Application filed January 24, 1888. Serial No. 261,760. (No model.)

To aZZ whom t may concern:

Be it known that I, FRANK LANSBERG, of the city of St. Louis, in the State of Missouri, have invented a certain new and useful Improvement in Air-Brakes, of which the following` is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, and in which- Figure I is a longitudinal section through the air-receiver and the brake-cylinders of my improved brake. Fig. II is a top view of the receiver and cylinders and air-pipes. Fig.III is a vertical section taken on line III III, Fig. II.

My invention consists in features of novelty hereinafter fully described, and pointed out in the claim.

Referring tothe drawings, l represents what is known as the train-pipe, which leads from the main air-tank 2 and which is connected with tanks 3 beneath the respective ears by a branch, 4, in which is located an automatic valve, 5, which is not fully shown here and which will not be described, as it forms no part of thisinvention. A valve like this is shown in iny application iiled herewith and identified as Oase C, Serial No. 261,762. At each end of the receiver 3 is a cylinder, 6, and each cylinder is provided with a piston, 7, having a rod, S, passing through the head 9 and connected, as usual, to the brake-levers of the respective ends of the car. The pipe4 is connected by branches 10 to the respective cylinders 6, and thus a communication is made between the receiver and the cylinders.

Then the brakes are to be applied, the air is allowed to pass from the receiver to the cylinders through the pipes 4 and l0, and as the cylinders are independent of each other it will be understood that the brakes of each will be applied without reference to the other, and, there being a sucient supply of air in the receiver, each piston 7 will be forced in the direction indicated by the arrows in Fig. I the required distance to set its brakes no matter what the condition of the shoes of o ne brake may be with reference to the otherthat is to say, if the shoes of one of the brakes are considerably worn, while the shoes of the other brake are new and not worn, the former will be applied in the same' degree as the latter, there being no connection between the two cylinders, whereby the power on the pistons is equalized, each brake being set independently of the other-thus differing from the construction heretofore used, where the pistons were located in a common cylinder and the air allowed to enter between them, so that the pressure upon them was necessarily equal and one could not be operated independently of the other to compensate for the wear of the shoes. Vith my invention this difculty is entirely avoided and either brake may be applied with the required pressure regardless of the condition of its shoes.

If desired, the air may be made to pass directly from the train-pipe l to the cylinders 6 without being taken into the receiver 3. It would be thus conducted through pipes l1, forming a direct communication between the `pipes l and the respective cylinders 6, as

shown.

The pipes l0 and the pipe 4 are provided with valves l2, that would be closed in case a direct connection was made, and in like manner the pipes 1I are provided with valves: 13, which would be closed in case the receiver is used. A

3() represents a spring surrounding each rod Sfor the purpose of forcing the piston back as the brakes are released.

I claim as my invention- In an air-brake, the combination, with the trainpipe l and receiver 3, of independent cylinders provided with pistons having rods located at each end of said receiver, the pipe 4, provided with valves connected to pipe l and receiver 3, the pipes 10each having a valve, 12, connected with pipe 4 and each of the cylinders, and the pipes Il, each having a valve, 13, communicating with pipe l and each of the cylinders, whereby said cylinders may be supplied from the receiver, or from both the receiver and train-pipe, or from the trainpipe alone, or either cylinder may be supplied from the train-pipe independently of the other cylinder and receiver, as set forth.

FRANK Il ANSBERG.

In presence of Gno. H. KNIGHT, EDWD. S. KNIGHT. 

